Electron Cyclotron Emission (ECE) is thermal blackbody radiation coming from electron Larmor motion. The ECE spectrum measurement is one of most popular electron temperature diagnostics in nuclear fusion plasma research. The 2- and 3- dimensional imaging ECE diagnostics systems were used for electron temperature fluctuation measurements with high time resolution. These systems adopt external quasi-optical mirror components with a receiver antenna to focus and to steer the viewing angle. A 2-dimensional imaging ECE diagnostics has been developed on the basis with adaptive-array techniques using a phased-array antenna. Radio-frequency detection systems with digitizers and software-defined radio devices are proposed to measure the ECE-phase as well as the ECE-amplitude in the adaptive technique approach. The software-defined radio system can continuously measure them with significant accuracy and time resolution. The radiation positions are reconstructed properly with the beam forming adaptive-array technique.